I checked the Sunkist orange juice which also recently came out with the no added sugar packs. Compared it to the usual Sunkit orange juice and the total amount of sugar is less in the 'no-added-sugar' pack. Didn't see any Marigold around though.

You don't need to calculate exactly how much sugar la.... too scrupulous. Just avoid as much sugary drinks as you possibly can and drink lots of plain water everyday. E.g. drink tea without sugar, donno about coffee since i'm not a coffee drinker.